Sub-Pixel LED Display Layout for Low-Noise Touch Integration
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Solution Overview
Problem
Existing display devices lack integrated touch functionality and efficient integration of light-emitting diodes (LEDs) with touch sensors, leading to suboptimal performance and design constraints.
Innovation Solution
A display device design that incorporates a display substrate with sub-pixel areas separated by banks, featuring LEDs and touch sensor electrodes on the same or different layers, utilizing self- and mutual-capacitance methods for touch sensing, and including force sensing electrodes for enhanced input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs and touch sensor electrodes are integrated in the same display device, then touch functionality is added to the display, but manufacturing complexity increases
Solution Approach 1:
The patent merges the LED light-emitting structure and touch sensor electrode structure into a single integrated display device. The LED is positioned in a first region while the touch sensor electrode is positioned in a second region, with both structures sharing the same substrate and manufacturing process flow, thereby adding touch functionality without requiring entirely separate manufacturing systems
Solution Approach 2:
The display device is segmented into distinct functional regions: a first region containing the LED light-emitting structure and a second region containing the touch sensor electrode structure. This segmentation allows each component to be optimized independently while maintaining overall integration, reducing manufacturing complexity by clearly defining separate functional zones
2Measurement precision
If touch sensor electrode area is increased to improve touch sensitivity, then touch detection capability is enhanced, but display area for LED is reduced
Solution Approach 1:
The display surface is divided into a first region for LED light emission and a second region for touch sensor electrode placement. This spatial segmentation allows both the LED display area and touch sensor area to be optimized independently, enabling the touch sensor electrode to have sufficient area for good detection capability without compromising the LED display area
3Adaptability or versatility
If multiple layers are used to separate LED and touch sensor electrode, then functional integration is achieved, but manufacturing precision requirements increase
Solution Approach 1:
An insulating layer is introduced as an intermediary between the LED light-emitting structure and the touch sensor electrode structure. This insulating layer serves multiple functions: electrical isolation between components, mechanical spacing to define regional boundaries, and a reference plane for alignment during manufacturing, thereby reducing the precision requirements for direct component placement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables seamless integration of LED display and touch functionality with improved sensitivity and reduced noise interference, allowing for advanced input detection capabilities.
Implementation Method 1
A light-emitting diode ("LED") is one type of a semiconductor element, that is, a p-n junction diode, in which holes and electrons are injected when a forward bias is applied thereto and energy generated by recombination of the holes and electrons is transformed into light.
Implementation Method 2
the touch sensor electrode may include an electrode operating in a self-capacitance method and sense a capacitance change of a single touch electrode
Data Source
AI summary
A display device includes a display substrate in which a plurality of sub-pixel areas is defined, a light-emitting diode (“LED”) on the display substrate, a touch sensor electrode on the display substrate and including at least one touch electrode, and a bank separating the plurality of the sub-pixel areas, where each of the plurality of the sub-pixel areas may include a first area in which the LED is disposed and a second area in which the touch sensor electrode is disposed.